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measuring a rotated radius

koike
I'm new to the CMM world and we're trying to measure a rotated radius (picture a cone with a concave wall.) Anything I've tried so far, short of making a jig, doesn't guarantee that a cross section is truly representative of the radius I'm trying to measure. We're using a Romer PCMM with PC-DMIS 4.3. Oh yeah, and position of the radius to a perpendicular surface is critical as well.

Thanks,
Matt
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  • Personally, I don't like to measure "part" of a circle, unless enough is available that I can have a reasonable amount of confidence with the results.

    Also, if the cicular (radius) feature isn't very round, then the results can become failrly meaningless.

    If the locus of that radius is well enough defined, then oribit around the conical feature at pre-determined rotations, and scan from the nominal radius centerline (locus) to the radius surface using multiple measurements at each rotation.

    I can make another diagram if necessary.

    I'd agree with you on this. Reporting actual radius can be pretty meanignless especially based on what often are the design criteria. Most designers don't know how to make the print reflect what they need so simply have a radius callout where a profile callout would be better.

    If you do what I sugest above and select fixed radius in the auto circle dialogue you can report min-max in the location dimension which gives you profile (form-only since the circle best fits to the points). I have used this many times and have never had a designer dispute the idea.
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  • Personally, I don't like to measure "part" of a circle, unless enough is available that I can have a reasonable amount of confidence with the results.

    Also, if the cicular (radius) feature isn't very round, then the results can become failrly meaningless.

    If the locus of that radius is well enough defined, then oribit around the conical feature at pre-determined rotations, and scan from the nominal radius centerline (locus) to the radius surface using multiple measurements at each rotation.

    I can make another diagram if necessary.

    I'd agree with you on this. Reporting actual radius can be pretty meanignless especially based on what often are the design criteria. Most designers don't know how to make the print reflect what they need so simply have a radius callout where a profile callout would be better.

    If you do what I sugest above and select fixed radius in the auto circle dialogue you can report min-max in the location dimension which gives you profile (form-only since the circle best fits to the points). I have used this many times and have never had a designer dispute the idea.
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